ME 405
Fall 2006
Professor John M. Cimbala Lecture 41
12/13/2006
Today, we will:
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Discuss sampling issues (isokinetic sampling and isoaxial sampling) in Section 9.2
Discuss impaction between moving particles (spray chambers, scrubbers, etc.) in
Section 9.3
If time, discuss filtration in Section 9.4
If time, discuss electrostatic precipitators in Section 9.5
Do SRTEs at 2:05
U = U0
c = c0
U = U0
c = c0
Q
(a)
Q
U = U0
c = c0
U < U0
c > c0
(b)
U > U0
c < c0
U = U0
Q
c = c0
(c)
U = U0
c = c0
Q
U = U0
c ≠ c0
(d)
Figure 9.9 Particle trajectories (dashed) and streamlines (solid) for (a) isokinetic, isoaxial
sampling, (b) subisokinetic, isoaxial sampling, (c) superisokinetic, isoaxial sampling,
(d) isokinetic, but non-isoaxial sampling (misaligned sampling probe); dividing
streamlines in (a), (b), and (c) are bold.